For all subjects, body weight, waist girth, blood pressure, fasting blood lipids, glucose, insulin and satiety hormones will be measured at weeks 1, 4 and 8. Each subject will arrive at the same chosen time for each session, between 8:00 and 10:00 a.m. Upon arrival, subjects will fill out a Sleep Habits and Stress Factors Questionnaire and a Food Intake and Activity Questionnaire. For each session, subjects will be asked to arrive after an overnight fast; only water will be allowed until 1 hour before blood collection.